Pump



May 1s 192e. 1,584,824

J. B. TEESDALE PUMP Filed Feb. 25, 1923 JOHN B. TEESDALE, 0F GRANDRAPDS, MICHIGAN.

PUMP.

Application filed February 23, 1523.

rlhe present invention relates to pumps; and its object is, generally,to provide a ro tary pump improved in certain respect:l hereinafterappearing, and more particular ly to provide priming means for pumps ofthis character.

rlhis and any other objects hereinafter appearing are attained by, andthe invention finds preferable embodiment in, the structure hereinafterparticularly described and illustrated by the accompanying drawings, inwhich Figure 1 is a transaxial sectional view of a rotary pump;

Figure 2 is an axial sectional view thereof taken on line 2 2 of Figure1;

Figure 3 is an enlarged detail transaxial view of parts of the same,showing a modilied construction; and

Figure fl is a detail transaxial view of certain parts, showing anothermodified construction.

ln the drawings, a rotary pump is shown, comprising a body 1 having across-sectionally circular chamber 2 horizontally dis posed axially, apassage 3 having an intake and a port l to the lower portion of saidchamber, the pump comprising also a crosssectionally circular piston 11in, and diametrically smaller than, the chamber and in axially parallelrelation therewith. Means are provided for travelling this pis'- tionabout an axis parallelly olfset from the pistons axis, i. e., in suchmanner that the axis of the piston moves in such travel in a circlewhose center is the axis of the chamber, the pumped liquid being thusforced circularly in the chamber by the snugly fit ting relation ofsuccessive portionsv of the pistons periphery with the chambers circularwall.

ln the construction illustrated, said means comprise the driving shaft13 coaxial with the chamber and carrying the eccentric cam member 12therein on which cam member the piston is turnably mounted. A closure 7extends transversely of the passage 3 and through the port 4, in spacedrelation from said ports sides, and is littingly connected swingably tothe body 1 at Serial No. 620,759.

8 and to the piston 11 at 10. This port l is at a lower level than thebottom of the pas* sage 3 toward its intake 5, so that when the pump isnot operating, a sufcient amount of liquid for priming its nextoperation may be retained in the port l at the intakeside thereof. Thispriming operation is insured by closures middle portion being denessedbelow its connections 8 and 10, thus forming a pocket for holding thepriming liquid.

lt will be seen that the rotation of the driving shaft 13 in thedirection of the arrow in Figure 1 draws the liquid into the chamber 2through the port e at the side thereof which is toward the intake 5 andexpels the liquid through said port as its opposite side which is towardthe vent 6 of the pump.

ln the modified construction shown in Figure 3, the closure 71 has aprojection 20 adapted to close the space 21 between the piston 111 andthe inner surface of the chamber at the port l1 when the piston movesaway therefrom.

ln the further modified construction illustrated in Figure l, a packingsheet is applied to the pistons perimeter and held in grooves 23 thereinby binding strips 2li,

l claim: n

1. ln a structure of the character described: a body having across-sectionally circular chamber horizontally disposed axially, and apassage having an intake and a port to the lower portion of the chamberat a lower level than the bottom of the passage toward its intake; across-sectionally circular piston within, and diametrically smaller'than, the chamber, in axially-parallel relation therewith; means fortravelling the piston about an axis parallelly offset from its axis; aclosure extending transversely of the passage and through, and in spacedrelation from the sides of, the port and litt-ingly connected to thepiston and the body.

2. In a structure of" the character described: a body having across-sectionally circular chamber horizontally disposed axially, and apassage having an intake and a port to the lower portion of the chamber;a Cross-seotionally circular piston Within, and diametrieally smallerthan, the chamber, in axially-parallel relation therewith; means fortravelling the piston about an 'axis parallellT offset from its axis; aclosure extending transversely of the passage and through, and in spacedrelation from the sides of, the port, and fitting-ly eonneeted to thepiston and to the body and having a portion intermediate, and depressedbelow, Such connections.

In testimony whereof l alif; my signature.

JOHN B. TEESDALE.

